Which of the following is NOT a basic component of a masonry wood-burning fireplace?

A masonry wood-burning fireplace typically consists of several essential components that work together to safely contain and vent the fire, allowing for efficient operation. The firebox is the area where the fire burns, designed to withstand high temperatures while containing embers. The flue is a duct that directs smoke and gases from the firebox up through the chimney, ensuring proper ventilation and safety. The chimney cap serves as a protective cover for the top of the chimney, preventing rain, debris, and animals from entering while allowing smoke to escape.

In contrast, a heat circulator is not a standard component of a masonry wood-burning fireplace. While it may enhance the heating efficiency of a fireplace by improving air circulation, it is an additional feature rather than a fundamental part of the fireplace's structure. Without it, the fireplace can still function effectively, demonstrating that it is not essential like the other components.